AFR Installation - PX200

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Main scooter: Piaggio Vespa PX200 1988
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Wed Feb 28, 2018 10:31 am

Hello,

I am planning to install a lambda sensor in order to better tune my Malossi 210 kitted PX. I have a PGM Bigbox in place and I was wondering what the ideal place to install it would be.

I thought about two seperate locations, marked with green and blue arrows here:

https://www.flickr.com/photos/150884345 ... ed-public/

Or this?

https://www.flickr.com/photos/150884345 ... ed-public/


Your suggestions are all welcome.

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Muttley McLadd
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Wed Feb 28, 2018 9:04 pm

My coop has a temp guage in a similar position to your second pic. It's fine there.. but if it was much longer, it'd be inconvenient.
Although, it does have a 90 bend in it, which makes it easier.
How much clearance would you have, if it was in the lower position?


Image
CakeAndArseParty

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coaster
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Wed Feb 28, 2018 10:27 pm

This is for an Air Fuel Ratio sensor not an EGT and I believe they need to be further away from the cylinder as the Lambda sensor is analysing the air/fuel mix rather than temperature. The one on my GTS is around 7"-8" down the pipe (the first pic would be about right) EGT's are about 4".

You won't be able to leave it fitted permanently though as the Lambda sensors don't like 2 stroke oil apparently. Having said that though, they are cheap as chips so if they last a thousand miles or so its just a maintenance item to change.....if its every 100 miles it would be a different matter.

I have a cheap digital AFR meter and will be welding a boss into my Lambretta Supertourer pipe soon for the same purpose as you.

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Main scooter: Piaggio Vespa PX200 1988
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Thu Mar 01, 2018 9:10 am

Thanks for the information. The installation is for tuning purposes only. I will take it off and plug the hole as soon as I am done collecting the data.

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RManson
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Tue Apr 24, 2018 5:56 am

I use one on my Rotax-barrelled Lambretta. Here's a shot of the pipe before I welded the bung in that shows where I located it in relation to the header. I was very pleased with the capability and how quickly I was able to set up the carb. Good luck!

ImageRotax Lamby build-203 by PotvinV8, on Flickr

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